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Development, Vol 117, Issue 2 625-639, Copyright © 1993 by Company of Biologists
JOURNAL ARTICLES |
MC Dickson, HG Slager, E Duffie, CL Mummery and RJ Akhurst
Department of Medical Genetics, Glasgow University, Yorkhill, UK.
We have performed a detailed analysis of the localisations of RNAs for TGF beta 2 and beta 3, and of TGF beta 2 protein in mouse embryos from 6.5 to 9.5 days post coitum, using in situ hybridisation and immunohistochemistry on serial sections, and whole-mount in situ hybridisation to complete embryos. TGF beta 3 RNA was not seen in any of the tissue sections, but very low levels of the RNA were seen by whole-mount in situ hybridisation around the outflow tract of the heart at 8.5 days post coitum. TGF beta 2 RNA is expressed at high levels in all cells with the potential to differentiate into cardiomyocytes. Additionally, the foregut endoderm, juxtaposed to the heart, and the neuroepithelium at the rostral extremity of the foregut, express very high levels of TGF beta 2 RNA, between 8.5 and 9.5 days post coitum. As cardiomyogenesis proceeds, TGF beta 2 RNA levels diminishes within the myocytes, with a concomitant increase in staining for TGF beta 2 protein. TGF beta 2 protein staining of cardiomyocytes persists throughout development and in the adult, in the absence of detectable levels of the corresponding RNA. Superimposed upon this myocardial pattern of expression, there is an upregulation of TGF beta 2 RNA in the myocardium of the outflow tract and atrioventricular canal between 8.5 and 9.5 days post coitum, which returns to low levels by 11.5 days post coitum. The results are discussed in terms of a potential role of TGF beta 2 in controlling cardiomyogenesis and in inductive interactions leading to cardiac cushion tissue formation.
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